I don't think hairless rats are any more nutritious than regular rats. They aren't completely lacking hair. Some snakes develop a a preference to them (much as some develop colour preferences), at the same time some may refuse to take them at all. They don't retain heat as well either.
Quote:
Originally posted by Syst3m
Snakes to not digest hair or teeth. But it still may play a role in digestion.
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Some small snakes may feed on pinky rabbits/rats/mice their whole lives, some snakes do develop the preference to hairless rats as well, some snakes do not even feed on mammals. All of these animals do quite well without a significant amount of hair in the diet. They don't seem to take any nutrition from the hair, as it comes out pretty much undigested. I wouldn't say that hair plays a significant role in digestion.